Comparison

Shellback vs eSUPPO

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Shellback

This app provides US Naval Surface Force personnel with offline access to essential information. It includes manuals and resources for administration, medical, operations, personnel management, safety, and navigation rules. Content is updated annually for relevance.

Highlights
  • Offline access to SURFOR information
  • Admin/Training manuals
  • Medical readiness resources
  • Operations and navigation training
  • Personnel management documents
  • Safety information and lessons learned
  • Rules of the Road quiz
Features
Read full description

What is the Shellback app? Shellback, formerly known as eDivo, is a free mobile app developed to support US Naval Surface Force (SURFOR) personnel in an easy-to-access offline environment. What is a Shellback? In naval tradition, a Shellback is a nickname for a Sailor who has crossed the Equator and thus transitioned from a novice Sailor, or Pollywog, to an experienced Sailor. Why do I need Shellback? Shellback provides Sailors the ability to download key SURFOR information on their own portable devices and access it while underway without the need for an internet connection. Shellback provides the most relevant and current information to SURFOR Sailors in one location. Content is scheduled for annual updates. What type of info can I find in Shellback? The information in Shellback is separated into several main categories: -Admin/Training: Contains the Correspondence Manual and the SURFOR Training and Readiness Manual. -Medical: Includes the Manual of the Medical Department, information on medical and physical readiness, mental health, Medical Evaluation Board procedures, the Disability Evaluation System, family member readiness, and more. -Operations: Includes information and training on bridge management, navigation basics, watch team tools, crew endurance, operating procedures for air-capable ships, Air Certification for Naval Surface Force Ships, and manuals for amphibs, maintenance, and other general ship operation resources. -Personnel Management: Provides documents on Navy personnel policy and administration. Also includes legal handbooks and manuals, resources for Surface Warfare Officers, and a variety of general personnel management resources. -Safety: Provides documents related to lessons learned, mishap reporting, notices, safety-related awards, and general safety resources. -Rules of the Road: This quiz tests a Sailor’s knowledge of maritime navigation rules.

About

eSUPPO

Access Supply Corps information quickly without multiple logins. Find news, job listings, educational programs, instructions, and contact your detailer. Content can be viewed offline and updates automatically when online.

Highlights
  • Access NAVSUP news
  • View billet listings
  • Find educational program info
  • Access NAVSUP instructions
  • Contact your detailer
  • Offline content viewing
  • Automatic content updates
Features
Read full description

Supply Officers (SUPPOs) and others in the Supply Corps community can quickly access Supply Corps information using the new eSUPPO app. You no longer have to log on to multiple websites to find what you need. You can quickly find NAVSUP news, billet listings, educational program information, NAVSUP instructions, and links to related Facebook pages and websites. Using eSUPPO, you can contact your detailer, access forms, and provide feedback via various surveys. eSUPPO can be used offline. Previously downloaded content can be viewed even when you have no Wi-Fi or cell service. When you’re online, content automatically updates.

Screenshots

Shellback3 screens
eSUPPO1 screens

Verdict

The call

The clearest difference is review sentiment: eSUPPO at 100% against Shellback's 45%. eSUPPO also leads on update cadence (every 2 months vs every 10 months) and rating (3.5 vs 3.2). Shellback's advantage is ratings volume (38 vs 6). On price, ads, in-app purchases and monetization model there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

eSUPPO holds the better App Store score, 3.5 against 3.2. That said, the two scores are not equally well evidenced: Shellback has 38 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 45% of Shellback's written reviews are positive against 100% of eSUPPO's.

UpkeepUpdate frequency

Shellback ships an update every 10 months, eSUPPO every 2 months. The most recent releases landed on September 29, 2026 and June 4, 2026 respectively.

Scorecard5 real differences · 5 level
Shellback versus eSUPPO: the parameters behind the verdict, then further details
ParameterShellbackeSUPPO
PriceFreeFree
Rating3.2 (38 ratings)3.5 (6 ratings) — better
Positive reviews45.2% of reviews100.0% of reviews — better
Number of ratings38 — better6
Update frequencyEvery 10 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.09.0 — better
Further details — not scored
Size71 MB40 MB
Age rating12+4+
DeveloperProgram Executive Office for Enterprise Information Systems, Sea Warrior ProgramNAVSUP Business Systems Center (BSC)

Customer experience

Shellback

All ratings38 ratings
Positive52.6%
Neutral5.3%
Negative42.1%
Written reviews42 reviews
Positive45.2%
Neutral19.0%
Negative35.7%

eSUPPO

All ratings6 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Shellback

No in-app purchases

None

eSUPPO

No in-app purchases

Questions

Is Shellback free?
Shellback is free to download, with no in-app purchases.
Is eSUPPO free?
eSUPPO is free to download, with no in-app purchases.
Which has better reviews, Shellback or eSUPPO?
eSUPPO is rated higher. Shellback averages 3.2 out of 5 from 38 ratings, while eSUPPO averages 3.5 from 6 ratings.
Do Shellback or eSUPPO have ads?
Neither Shellback nor eSUPPO shows ads.
Which is updated more often, Shellback or eSUPPO?
Shellback ships an update every 10 months, and eSUPPO every 2 months. Most recently, Shellback was updated on September 29, 2026 and eSUPPO on June 4, 2026.

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